摘要
方向元件是距离保护的重要组成部分,逆变型电源暂态故障特征会导致现有基于稳态工频相量的方向元件性能劣化,存在不正确动作风险。通过分析逆变型电源和常规电源故障后d轴电流暂态变化特征,提出了适用于逆变型电源场站送出线保护的方向元件,通过比较故障后短时间内正序d轴电流变化量判别故障的方向。电磁暂态仿真结果表明,逆变型电源的故障穿越控制目标和故障前输出功率发生变化时,所提方向元件仍然适用,能够准确识别故障方向。建立了典型的逆变型电源送出系统动模试验模型,动模试验数据表明所提方向元件能够快速准确判别故障方向,在现有保护装置采样率下性能良好。
The directional element is a critical component of distance protection.However,the transient fault characteristics of the inverter-interfaced generator(IIG)may degrade the performance of conventional directional elements relying on steady-state power-frequency phasors,posing risks of maloperation.By analyzing the transient characteristics of d-axis current in IIGs and conventional generators during faults,this paper proposes a protection directional element for the transmission line of inverter-interfaced generator stations.The proposed method identifies the fault direction by comparing the variation of positive-sequence d-axis current shortly after the fault.Electromagnetic transient simulation results show that the proposed directional element remains applicable under conditions of varying fault ride-through control objectives and pre-fault output power in IIGs,ensuring accurate fault direction identification.A dynamic simulation test model for a typical IIG transmission system is also established,with experimental data confirming that the proposed directional element achieves rapid and accurate fault direction identification,exhibiting satisfactory performance under the sampling rate of existing protective devices.
作者
文明浩
陈玉
王玉玺
马睿智
韩珂
许晴源
WEN Minghao;CHEN Yu;WANG Yuxi;MA Ruizhi;HAN Ke;XU Qingyuan(XJ Electric Co.,Ltd.,Xuchang 461000,China;State Key Laboratory of Advanced Electromagnetic Technology(Huazhong University of Science and Technology),Wuhan 430074,China)
出处
《电力系统自动化》
北大核心
2025年第14期190-199,共10页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(52277103)。
关键词
逆变型电源
距离保护
方向元件
故障电流
正序电流变化量
inverter-interfaced generator
distance protection
directional element
fault current
positive-sequence current
